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---
grand_parent: Synchronization Primitives
parent: cuda::atomic
---
# `cuda::atomic::fetch_max`
Defined in header `<cuda/atomic>`:
```cuda
template <typename T, cuda::thread_scope Scope>
__host__ __device__
T cuda::atomic<T, Scope>::fetch_max(T const& val,
cuda::std::memory_order order
= cuda::std::memory_order_seq_cst);
```
Atomically find the maximum of the value stored in the `cuda::atomic` and `val`.
The maximum is found using [`cuda::std::max`].
## Example
```cuda
#include <cuda/atomic>
__global__ void example_kernel() {
cuda::atomic<int> a(0);
auto x = a.fetch_max(1); // Operates as if unsigned.
auto y = a.load();
assert(x == 1 && y == 0);
}
```
[See it on Godbolt](https://godbolt.org/z/rexn5T78G){: .btn }
[`cuda::std::max`]: https://en.cppreference.com/w/cpp/algorithm/max
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